A number of Channels will broadcast the event live online in specific regions. Except for MatchTV (which you can stream for free with a VPN from anywhere), all other official broadcasters are paid and will require you to subscribe to watch the fight online. Here are some of the most-watched channels you can tune into if you in their broadcasting regions and watch ufc on roku online few channels also broadcast UFC Fight Night events as well like BT Sport:
ESPN Sports (United States)
BT Sport (United Kingdom)
Sky Sports (United Kingdom)
OSN (Middle East)
Fight Network (Canada)
ViaPlay (Denmark)
WOWOW (Japan)
MatchTV (Russia)
Globo (Brazil)
